Plugged in, battery removed and at 40%. Plugged in will keep the clock accurate and the internal PRAM battery charged and in good condition. However, storing a battery at 100% charge for a long time is a good way to lose capacity quickly. Hence, discharge it to 40%, then store it in a cool location. Tom Klinkowstein <klinkows at mediaa.com> writes: > I have a MacBook Pro as my everyday machine and a Aluminum G4 > Powerhook to use as backup in case the MacBook Pro needs service. > > I will only use the Powerbook when and if the MacBook Pro needs > service. > > Should I store the Powerbook plugged in or unplugged?